The busy station had been closed and police told people in the area to take shelter in stores.

The Metropolitan police said there were no reports of casualties and they had not located any suspects yet.

The Metropolitan Police says officers were called just after 4:30 p.m. to "a number of reports of shots fired on Oxford Street and underground at Oxford Circus tube station."

Police called at 16:38 to a number of reports of shots fired on #OxfordStreet & underground at Oxford Circus tube station. Police have responded as if the incident is terrorist related. Armed and unarmed officers are on scene and dealing along with colleagues from @BTP